You've probably read some or all of these but:

The Great Gatsby by F Scott Fitzgerald
The Rainbow by D H Lawrence (though Lawrence is a love-or-hate author)
Gone with the Wind by Margaret Mitchell
The Man Who Was Thursday - G K CHESTERTON (and all the Father Brown books)
The Blue Castle - L M MONTGOMERY
The Daughter of Time - Josephine TEY
Also, Edith Wharton.